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What is the formula used to determine the maximum allowable amperage for a given circuit?
There is no single 'formula' for this, as the maximum current a circuit can handle depends on the temperature the various components within that circuit can operate at, without deterioration. There are so many factors involved, such as the type of component, the type of insulation, whether it can cool naturally or whether it must be force cooled, etc. Every circuit must be considered on an individual basis.
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What is the formula for calculating the full current load of a 400 watt metal halide light?
For the amperage of a metal halide fixture look for the nameplate which can be found on the side of the ballast. There it will tell you what the amperage of the fixture draws. Knowing what one fixture draws will allow you to size the lighting circuit for wire and breaker sizes.
How do you calculate the voltage drop for 238 KW 3 phase 415 V and length of circuit is 20 meters?
You need also to know the resistance of the cable. First you establish what the current of the load is. Then from that you calculate the wire size. From a wire size chart you find the wire resistance. Then use the formula I (squared) x R.
What is the amperage for a 20000 volt-amp heating unit on a 240 volt single phase circuit?
Volt amps is the same way of saying watts. This is seen in the formula Watts = Volts x Amps. Using the formula I = W/E we transpose I = 20000/240 = 83.33 amps.
When the resistance in an electrical circuit increases and the voltage does not change the current flowing in the circuit?
Here is the formula you use. I = E/R. I = amperage, E = volts, R = resistance in ohms.
What is the formula for total current in a series circuit?
Current = (Voltage across the circuit) divided by (Total resistance of the circuit). The current is the same at every point in the series circuit.
